TWI771984B

This stretching device 100 comprises: a pair of rail devices 10L, 10R that each define an endless circulation path and that are disposed on the left and right sides of a film; a plurality of clip units CU that travel along the circulation paths of the pair of rail devices 10L, 10R and that grip the film; a linking mechanism 50 that links adjacent clip units CU on the circulation paths; a drive mechanism 60 that causes the clip units CU to travel along the circulation paths; an adjustment mechanism 70 that adjusts the pitch in the vertical direction and the pitch in the horizontal direction of the clip units CU; and a controller 80 that controls the operation of the drive mechanism 60 and the adjustment mechanism 70, wherein the controller 80 controls the rotation of outlet-side sprockets 62L, 62R in accordance with the load acting on the rail devices 10L, 10R from the clip units CU.